* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: Arial, sans-serif; }

/* BANNER */
.buy-banner {
    height: 260px;
    background: url('../img/banner.jpg') center/cover no-repeat;
    position: relative;
}
.buy-banner-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,.55);
    display: flex;
    align-items: center;
    justify-content: center;
}
.buy-banner-overlay h1 {
    color: #fff;
    font-size: 40px;
}

/* HERO */
.book-hero {
    background: #2f2f2f;
    color: #fff;
    padding: 80px 0;
}
.container {
    max-width: 1200px;
    margin: auto;
    padding: 0 20px;
}
.hero-grid {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 60px;
    align-items: center;
}
.hero-image img {
    width: 100%;
    max-width: 360px;
    box-shadow: 0 20px 40px rgba(0,0,0,.4);
}
.hero-content h2 {
    font-size: 34px;
    color: #ff6b6b;
}
.hero-content h4 {
    font-size: 18px;
    margin-bottom: 14px;
}
.underline {
    width: 60px;
    height: 4px;
    background: #ff6b6b;
    margin: 18px 0;
}
blockquote {
    font-style: italic;
    margin-bottom: 20px;
}
blockquote span {
    display: block;
    color: #ff6b6b;
    margin-top: 6px;
}
.buy-row {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}
select {
    padding: 12px;
    min-width: 160px;
}
.buy-btn {
    background: #ff6b6b;
    color: #fff;
    padding: 12px 26px;
    border: none;
    cursor: pointer;
    font-weight: bold;
}
.buy-btn:hover {
    background: #e05656;
}

/* SYNOPSIS */
.synopsis {
    padding: 90px 0;
    background: #fff;
}
.synopsis h2 {
    color: #ff6b6b;
    font-size: 32px;
    margin-bottom: 20px;
}
.edition {
    margin-bottom: 30px;
}
.synopsis-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    line-height: 1.8;
}
.toc-btn {
    display: inline-block;
    margin-top: 40px;
    background: #ff6b6b;
    color: #fff;
    padding: 14px 26px;
}

/* RESPONSIVE */
@media (max-width: 900px) {
    .hero-grid {
        grid-template-columns: 1fr;
    }
    .synopsis-grid {
        grid-template-columns: 1fr;
    }
}